<template>
  <div class="spec-preview">
    <!--商品图片-->
    <img :src="skuInfo.skuDefaultImg"/>
    <div class="event" @mousemove="handler"></div>
    <!--放大后的图片-->
    <div class="big" v-if="skuInfo.skuImageList">
<!--            <img :src="skuInfo.skuImageList[0].imgUrl"/>-->
      <img :src="skuInfo.skuDefaultImg" ref="big"/>
    </div>
    <!--遮罩层-->
    <div class="mask" ref="mask"></div>
  </div>
</template>

<script>

import {mapGetters} from "vuex/dist/vuex.mjs";

export default {
  name: "Zoom",
  computed: {
    ...mapGetters('detail', ['skuInfo'])
  },
  methods: {
    handler(event) {
      let mask = this.$refs.mask;
      let big = this.$refs.big;
      let left = event.offsetX - mask.offsetWidth / 2;
      let top = event.offsetY - mask.offsetHeight / 2;
      if (left < 0) {
        left = 0
      }
      if (left >= mask.offsetWidth) {
        left = mask.offsetWidth
      }
      if (top < 0) {
        top = 0
      }
      if (top >= mask.offsetHeight) {
        top = mask.offsetHeight;
      }
      mask.style.left = left + 'px';
      mask.style.top = top + 'px';
      big.style.left = -2 * left + 'px';
      big.style.top = -2 * top + 'px';
    }
  }
}
</script>

<style lang="less">
.spec-preview {
  position: relative;
  width: 400px;
  height: 400px;
  border: 1px solid #ccc;

  img {
    width: 100%;
    height: 100%;
  }

  .event {
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    z-index: 998;
  }

  .mask {
    width: 50%;
    height: 50%;
    background-color: rgba(255, 37, 27, 0.3);
    position: absolute;
    left: 0;
    top: 0;
    display: none;
  }

  .big {
    width: 100%;
    height: 100%;
    position: absolute;
    top: -1px;
    left: 100%;
    border: 1px solid #aaa;
    overflow: hidden;
    z-index: 998;
    display: none;
    background: white;

    img {
      width: 200%;
      max-width: 200%;
      height: 200%;
      position: absolute;
      left: 0;
      top: 0;
    }
  }

  .event:hover ~ .mask,
  .event:hover ~ .big {
    display: block;
  }
}
</style>